x.async benchmarks

This folder contains cautious local benchmarks for the public x.async API. They are observation tools, not correctness tests and not portable performance claims.

Available benchmark

• async_benchmark.v: measures short default runs for Group, Task[T], Pool, bounded pool admission, with_timeout(), and every().
• run_async_benchmark.sh: builds and runs the benchmark with the local ./v, isolated VTMP/VCACHE, and a temporary output binary.

Run

From the repository root:

sh vlib/x/async/benchmarks/run_async_benchmark.sh

The script is serialized by design. Do not run multiple V benchmark or test runners against the same checkout/cache without isolating VTMP, VCACHE, and output paths.

Parameters

The defaults are intentionally small. Tune them locally with:

• XASYNC_BENCH_GROUP_ROUNDS
• XASYNC_BENCH_GROUP_JOBS
• XASYNC_BENCH_TASK_ROUNDS
• XASYNC_BENCH_POOL_JOBS
• XASYNC_BENCH_POOL_WORKERS
• XASYNC_BENCH_POOL_BOUNDED_ROUNDS
• XASYNC_BENCH_POOL_BOUNDED_TIMEOUT_MS
• XASYNC_BENCH_TIMEOUT_ROUNDS
• XASYNC_BENCH_EVERY_ITERATIONS
• XASYNC_BENCH_EVERY_INTERVAL_MS

The bounded pool admission case exercises submit_with_timeout() while the pool is full and submit_with_context() after capacity opens. The timeout only bounds admission; the benchmark does not make performance assertions.

Do not commit machine-specific benchmark results as permanent truth. Tests remain the authority for functional and concurrency-safety validation.